Today's Message Index:
----------------------
1. 12:25 AM - Re: Large mag drop (conrad)
2. 02:26 AM - SV: Large mag drop (hansjd)
3. 05:06 AM - Re: I Love Left handed drill bits (Thom Riddle)
4. 06:52 AM - Re: Large mag drop (krazydoc33)
5. 09:20 AM - Re: Large mag drop (Roger Lee)
6. 09:26 AM - Re: I Love Left handed drill bits (Roger Lee)
7. 10:34 AM - Re: Re: I Love Left handed drill bits (FLYaDIVE)
8. 02:54 PM - Re: I Love Left handed drill bits (Roger Lee)
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| Subject: | Re: Large mag drop |
Looks like you might have a couple of plug caps swapped.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404356#404356
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| Subject: | Re: I Love Left handed drill bits |
I am aware that Rotax puts the blue loctite on that screw. I am also aware that
they have changed their minds on many other things as their customer base's experience
increased over the years. As experience grew they have redesigned or
changed specs on many things over the years. One original design element in particular
that caused all kinds of grief which they eventually changed was the
internal Torx type fitting on the gearbox magnetic oil fitting.
My experience with aluminum threads, where no in-use external torque is applied
in the loosening direction, is that no thread locker is needed due to the high
coefficient of friction. Perhaps Rotax will one day realize that loctite is
not needed on this carb part. Until then, use it if you want.
I remove it from the carbs I disassemble and do not apply new loctite when re-installing.
In fact upon reinstallation I torque it only with thumb and one finger
because even without loctite it very easy to over torque this part and make
the left-handed drills or easy-outs a required part of future disassembly. Been
there once and that was enough.
--------
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404362#404362
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| Subject: | Re: Large mag drop |
Hi Roger,
By a wire wrong I ASSume that you mean a plug wire? I will check that
but it is the same as it came from Van's. The mag check was done at 4000 rpm
both before the run at 5000+rpm and after that too. No change.
The plug gap is at 0.020", I will open them up to 0.028". There is an electric
pump just after the fuel tank and I have run with that on, usually about 5 psi
is shown on the fuel pressure gauge. There is a fuel return line to the tank.
The vent tubes come down to the drip tray. Every thing indicates flooding or a
very rich mixture. With a lycorasuras I would run it close to wide open and lean
it out very aggressively but can't or don't know how to do that with the Bings.
I have done a mechanical sync. but not yet done a pneumatic sync.
I ASSume that the two ignition systems, A & B, each control one set of plugs, upper
and lower although I have not yet found in the documentation which one is
the upper plugs and which is the lower plugs.
Do you make house calls? :)
Thanks
Henry, Los Lunas, NM
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404371#404371
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| Subject: | Re: Large mag drop |
Hi Henry,
The plug gap is way to small. The Rotax specs are .023 (cold weather and .027 hot
weather) Do not gap them wider. This will change the mag drop all by itself.
Then as Conrad suggest look at the plug wires. The wires are labeled. #1 cyl.
is front right, #3 is rear right, #2 is front left and #4 is rear left. Try
not running the electric pump. You may be flooding. You absolutely need to do
a pneumatic sync. All a mechanical sync does is get you in the ballpark for
idle and hopefully close for higher rpm runs, but it can be significantly off.
Do all of these things first before the next start.
The ignition system chart you are referring to is in the Heavy Maint. manual.
After you do these couple of things then try a new mag drop and let us know the
results.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404390#404390
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| Subject: | Re: I Love Left handed drill bits |
Hi Thom,
The reason Loctite is applied here is that these are two different metals and this
area gets significant vibration and any loosening would cause a needle change
in the jet and possibly a aircraft incident before it was found. I'm sure
they have had their reasons over the last 22 years to apply this. It's a better
safe than sorry application. Too much Loctite here can be a problem getting
it out later. Just the tiniest drop is needed. If it still has some of the old
Loctite on the screw it will work just fine. Heating it is no big deal either
for removal. Like I said, I take a small butane torch and heat it for a few seconds
and they all come right out.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404391#404391
Message 7
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| Subject: | Re: I Love Left handed drill bits |
Gaggle:
>From a Test Engineer viewpoint; Thom is quite accurate with aluminum
threads not requiring a liquid locking agent. There are a few questions
that would have to be asked though:
1 - What type of aluminum is the part made from?
2 - What temper is it brought to?
3 - Was the tempering done before or after the threads were cut?
4 - Were the threads cut or rolled?
5 - What type of thread is being used?
6 - What material is the part being threaded into?
And then a repeat of all the questions above about the mating threaded part:
7 - What type of aluminum is the part made from?
8 - What temper is it brought to?
9 - Was the tempering done before or after the threads were cut?
10 - Were the threads cut or molded <-- Since this is a internal thread.
11 - What type of thread is being used? <-- This should be the same as the
mating part - BUT - Sometimes one company makes part A and another makes
part B and little things like percentage of thread is different.
Now if both parts are aluminum and ESPECIALLY if they are not ANODIZED,
There is a very high possibility of galling and/or fretting.
Some methods of prevention are:
Shoulder Seat - To limit force/torque on threads - This is something Roatx
really should consider. Maybe in the next generation of engineering
changes.
Lock washer - I guess none was used in this situation.
Nylon Stop Plug
Teflon Tape - Not for this situation. Untrained users.
Teflon Paste - HMmmmm much better idea - But 99.9987% of the users tend to
OVER APPLY it and cause catastrophic problems.
Liquid Locking Compound - Well this would be BLUE Loctite but there is a
problem with this -- They advertize a holding strength of 8.5 Nm (~6.2
Ft/Lbs). Well this is WAY too much holding force for such a small thread
and material. So, again I hope Rotax makes some changes. AND when Loctite
did this testing and came up with the 8.5 Nm, they did NOT test it on
aluminum threads. Holding force is VERY argumentative. They TRY to be
scientific but in the long run it is a shot in the twilight.
Last point: It truly is a good idea to use SOMETHING on the threads. Not
really needed too much for holding but for thread protection. If aluminum
threads are not protected they will gall/frett and LOCK-UP! From an FAA
standpoint they and you need some reassurance that the thing will not
vibrate free in flight AND should be easy to remove for
inspection/repair/replacement. Just think there are companies that have
made entire fortunes on just doing that - Loctite!
*Barry*
On Wed, Jul 10, 2013 at 8:05 AM, Thom Riddle <riddletr@gmail.com> wrote:
> >
>
> I am aware that Rotax puts the blue loctite on that screw. I am also aware
> that they have changed their minds on many other things as their customer
> base's experience increased over the years. As experience grew they have
> redesigned or changed specs on many things over the years. One original
> design element in particular that caused all kinds of grief which they
> eventually changed was the internal Torx type fitting on the gearbox
> magnetic oil fitting.
>
> My experience with aluminum threads, where no in-use external torque is
> applied in the loosening direction, is that no thread locker is needed due
> to the high coefficient of friction. Perhaps Rotax will one day realize
> that loctite is not needed on this carb part. Until then, use it if you
> want.
>
> I remove it from the carbs I disassemble and do not apply new loctite when
> re-installing. In fact upon reinstallation I torque it only with thumb and
> one finger because even without loctite it very easy to over torque this
> part and make the left-handed drills or easy-outs a required part of future
> disassembly. Been there once and that was enough.
>
> --------
> Thom Riddle
> Buffalo, NY (9G0)
>
>
> Don't worry about old age... it doesn't last very long.
> - Anonymous
>
>
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| Subject: | Re: I Love Left handed drill bits |
I may agree about aluminum, but from the Bing and Rotax guys it's a liability issue.
Adding a little heat as far as they are concerned is no big deal for peace
of mind.
Should be peace of mind for you now too.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404416#404416
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